In order to get pregnant you have to have sex on your fertile days. And based on what.you told us those weren't your fertile days. Use ovulation kits and try again next month. It took me and my hubby 7 months to get pregnant. It takes time.
Assuming you run about a 28 day cycle, you would likely ovulate around 2/14, about 14 days after the first day of your last menstrual cycle. Sperm can live inside the body for up to 3 days, so continuing to have intercourse until you ovulate will increase your chances of conceiving. It's worth investing in ovulation predictor kits. They will give you a 24-48 hour window of when your ovulation will occur so you can plan to TTC on your most fertile days.